JP3542698B2 - Paper feeder - Google Patents

Paper feeder Download PDF

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Publication number
JP3542698B2
JP3542698B2 JP12021797A JP12021797A JP3542698B2 JP 3542698 B2 JP3542698 B2 JP 3542698B2 JP 12021797 A JP12021797 A JP 12021797A JP 12021797 A JP12021797 A JP 12021797A JP 3542698 B2 JP3542698 B2 JP 3542698B2
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JP
Japan
Prior art keywords
paper
roller
sub
paper feed
feed roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP12021797A
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Japanese (ja)
Other versions
JPH10297780A (en
Inventor
清人 小室
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP12021797A priority Critical patent/JP3542698B2/en
Priority to DE69824780T priority patent/DE69824780T2/en
Priority to DE69828088T priority patent/DE69828088T2/en
Priority to EP02004394A priority patent/EP1219554B1/en
Priority to US09/057,517 priority patent/US6105953A/en
Priority to EP98106579A priority patent/EP0872351B1/en
Publication of JPH10297780A publication Critical patent/JPH10297780A/en
Application granted granted Critical
Publication of JP3542698B2 publication Critical patent/JP3542698B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Handling Of Cut Paper (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Description

【0001】
【発明の属する技術分野】
本発明はプリンタの紙送り装置に関し、より詳しくは手差し機構に特徴を有する紙送り装置に関する。
【0002】
【従来の技術】
記録書込み部の下方に用紙のスタック部を設けることは装置の配設スペースを軽減する上で得策であるが、反面におてこのように構成した場合には、用紙の搬送経路をU字状に形成しなければならなくなる関係上、その搬送抵抗が大きくなって、プリンタ本体外から直接手差しする給紙経路との間で紙送り精度に違いが生じ、いては印字品質に差がるといった不都合が生じる。
【0003】
【発明が解決しようとする課題】
本発明はこのような問題に鑑みてなされたもので、その目的とするところは、自動給紙、手差し給紙の如何に拘りなく品質の一定した印字を可能にする新たな紙送り装置を提供することにある。
【0004】
【課題を解決するための手段】
すなわち、本発明はかかる課題を達成するための紙送り装置として、記録書込み部へ至る平坦な紙搬送経路の上手側に用紙を前記記録書込み部へ送り込むメイン紙送りローラを配設するとともに、前記メイン紙送りローラの上手側に、サブ紙送りローラを用いた反転紙搬送経路と、手差し紙検出センサを備えた手差し紙経路とを設けて合流部を形成し、前記合流部に、前記反転紙搬送経路及び手差し紙経路からの各用紙を検出する頭出し検出センサと、前記サブ紙送りローラに接離自在な押圧ローラとを配設して、自動給紙信号もしくは前記手差し紙検出センサからの検出信号のいずれか一方の信号により前記サブ紙送りローラを始動させる一方、前記用紙が前記メイン紙送りローラに所定量送り込まれると、前記頭出し検出センサからの信号により前記サブ紙送りローラへの駆動力を断ち、また前記押圧ローラを前記サブ紙送りローラから離間させてから、前記メイン紙送りローラを始動させるようにした。
【0005】
【作用】
このように構成したことにより、ホッパからの記録紙あるいはプリンタ本体外から挿入された手差し紙のいずれかがメイン紙送りローラのもとへ送り込まれた時点で、押圧ローラをサブ紙送りローラから離間させた上でメイン紙送りローラを始動することによって、自動給紙、手差し給紙の如何にりなく紙送り精度を一定となして、均一な品質の印字を実現する。
【0006】
【発明の実施の形態】
そこで以下に本発明の実施例について説明する。
図面はいずれも本発明の一実施例を示したものである。
【0007】
図において符号1で示したプリンタ本体には、記録紙を反転して搬送するサブ紙送りローラ2を挟んで、その下方にはホッパ3内の記録紙をこのサブ紙送りローラ2に向けて送り出すピックアップローラ5が配設され、また、その上方にはメインの紙送りローラ21を備えたフラットな紙案内20が設けられていて、サブ紙送りローラ2によってU字状に反転搬送されてきた記録紙をメインの紙送りローラ21によってインクジェット記録ヘッド24のもとに送り込むように構成されている。
【0008】
ところで、図中符号7、7及び13は、サブ紙送りローラ2の周囲に配設した第1及び第2の押圧ローラで、これらの押圧ローラ7、13のうち、第1の押圧ローラ7、7は共通の支枠8に支持された上、紙端検出センサ6の紙搬送方向下手側に配設され、記録紙がメインの紙送りローラ21のもとへ送り込まれた際には、ローラレリース用のカム18によって操作される第1のローラレリースレバー9によりサブ紙送りローラ2の周面から離間するように動作するが、常時は、付勢バネ11に付勢されてサブ紙送りローラ2の周面に圧接している。
【0009】
これに対して第2の押圧ローラ13は、印字ヘッド24へ延びるフラットな紙案内経路20と手差し案内経路22との合流点で、第2のローラレリースレバー14に支持されつつサブ紙送りローラ2に接離自在に配設され、自動給紙の際あるいは手差し給紙の際には、レバー14に作用する付勢バネ15によってサブ紙送りローラ2の周面に圧接し、これらの紙がメインの紙送りローラ21のもとに送り込まれたときには、ローラレリースレバー14に作用するローラレリース用のカム18によってサブ紙送りローラ2の表面から離間するように動作する。
【0010】
なお、図中符号25はメインの紙送りローラ21の直前に設けた頭出し検出用のセンサ、27は手差し案内経路22に設けた手差し紙検出用のセンサをそれぞれ示している。
【0011】
このように構成された紙送り装置において、通常の給紙時には、紙送りモータに駆動されたカム18が図1の矢印方向に回転して第1のローラレリースレバー9の押し上げを解いて、支枠8に作用する付勢バネ11により2つの押圧ローラ7、7をサブ紙送りローラ2の周面に圧接させると同時に、第2のローラレリースレバー14の押し上げを解いて、このレバー14上の押圧ローラ13をバネ15の付勢力によりサブ紙送りローラ2の周面に押圧する。
【0012】
これにより、ピックアップローラ5によりホッパ3内から引出された記録紙は、サブ紙送りローラ2と押圧ローラ7のニップ部に達し、紙端検出センサからの出力信号により回転したサブ紙送りローラ2によってフラットな紙案内板20上に送り出される。
【0013】
そして記録紙がメインの紙送りローラ21のもとへ送り込まれると、頭出し検出センサ25からの検出信号によりサブ紙送りローラ2への駆動力が断たれ、また、図2に示したように、第1、第2のローラレリースバー9、14は反転したカム18の山部により回動してそれぞれの押圧ローラ7、13をサブ紙送りローラ2の周面から離間させ、サブ紙送りローラ2の自由な転動と記録紙への押圧解除とによって、メインの紙送りローラ21に与える紙送りの抵抗とバックテンションによる影響を排除して、紙搬送経路20上で記録紙の送り量を正しく制御しつつこれを記録ヘッド24のもとに送り込む。
【0014】
これに対して、はがき等の手差し紙Sに印刷をする場合には、図に示したように、プリンタ本体1の外から手差し紙をサブ紙送りローラ2と第2の押圧ローラ13のニップ部に向けて差し込む。これにより、手差し経路に設けた手差し紙検センサ27はこれを検出し、その検出信号によりサブ紙送りローラ2を回転させて手差し紙Sをメインの紙送りローラ21のもとへ送り込む。
【0015】
このようにして手差し紙Sがメインの紙送りローラ21に送り込まれると、メインの紙送りローラ21の直前に配設された頭出し検出センサ25がこれを検出してその検出信号に基づいてサブ紙送りローラ2の駆動力を断つとともに、図2に示したように、第1、第2のローラレリースカバー9、14は反転したカム18の山部18a、18bにより回動してそれぞれの押圧ローラ7、13をサブ紙送りローラ2の周面から離間させ、サブ紙送りローラ2の自由な転動と手差し紙Sへの押圧を解除してメインの紙送りローラ21を回転させ、そのローラ21の回転力のみによって手差し紙Sの送り速度を正確にコントロールしつつこれを記録ヘッド24のもとへ送り込んで、この面に鮮明な記録像を形成させる。
なお、上述した実施例では、用紙のスタック部の下流側と手差し経路の合流部の2箇所に押圧ローラを配設したものであるが、自動給紙と手差し給紙のいずれの紙送りの場合にも、その精度を一定に保には、接離自在な押圧ローラを少なくとも合流部に設けるようにすればよい。
【0016】
【発明の効果】
以上述べたように本発明によれば、頭出し動作における一定の精度が確保出来るばかりでなく、反転紙搬送経路を経て曲げくせを付けられた状態で平坦な紙搬送経路に送り込まれてきた用紙がその腰の強さによりバックテンションや紙送りの負荷抵抗等をメイン紙送りローラに及ぼさせるのを極力排除して、手差し紙の搬送と同様にいずれの給紙の場合においても、記録書込み部への用紙の送り込み精度を可能な限り高めてより鮮明な記録書込みを図ることができる。
【図面の簡単な説明】
【図1】自動給紙の状態をもって示した本発明の一実施例をなす装置の構成図である。
【図2】手差し給紙の状態をもって示した同上装置の構成図である。
【符号の説明】
2 反転紙送りローラ
3 ホッパ
7、13 押圧ローラ
18 ローラレリース用のカム
20 フラットな紙搬送経路
21 メインの紙搬送ローラ
22 手差し経路
24 記録ヘッド
24、27 検出センサ
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a paper feeder for a printer, and more particularly to a paper feeder having a manual feed mechanism.
[0002]
[Prior art]
Although the provision of the stack of the paper under the recording write unit is advisable in reducing the installation space of the apparatus, in the case of such a configuration and have contact to the contrary is, U-shaped conveyance path of the paper Jo the formed onto it needs not relationships have, the conveyance resistance is increased, a difference occurs in the paper feed accuracy between outside the printer main body of a paper feed path for directly manually fed, it is not shed out the difference in print quality Inconvenience such as
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of such a problem, and an object of the present invention is to provide a new paper feeder capable of performing printing with constant quality regardless of automatic paper feed and manual paper feed. Is to do.
[0004]
[Means for Solving the Problems]
That is, according to the present invention, as a paper feeder for achieving the above object, a main paper feed roller for feeding paper to the recording / writing unit is disposed on the upper side of a flat paper conveyance path to a recording / writing unit, On the upper side of the main paper feed roller, a reversing paper transport path using a sub paper feed roller and a manual paper path having a manual paper detection sensor are provided to form a junction, and the reversing paper is formed at the junction. a cue detection sensor for detecting the respective sheet from the conveyance path and the manual feed paper path, and disposed freely contacts and separates pressing roller to said sub-paper feeding roller, automatic sheet feed signal or from the manual feed paper sensor while for starting the sub-paper feeding roller by one of the signal of the detection signal, when the paper is fed a predetermined amount in the main paper feeding roller, or receive from the cue detection sensor The cut off the driving force of the sub-paper feeding roller, and from that they are spaced from each said pressing roller from the sub-paper feeding roller, and so as to start the main paper feeding roller by.
[0005]
[Action]
With this configuration, when either the recording paper from the hopper or the manual paper inserted from outside the printer body is fed to the main paper feed roller, the pressing roller is separated from the sub paper feed roller. by starting the main paper feeding roller on which is, automatic paper feeding, forms a constant how related Rinaku paper feed precision of the manual feed, we achieve the printing of a uniform quality.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Therefore, embodiments of the present invention will be described below.
The drawings all show one embodiment of the present invention.
[0007]
In the printer body indicated by reference numeral 1 in the figure, a sub-paper feed roller 2 for reversing and transporting the recording paper is sandwiched therebetween, and the recording paper in the hopper 3 is sent out toward the sub-paper feed roller 2 below the sub paper feed roller 2. A pickup roller 5 is provided, and a flat paper guide 20 provided with a main paper feed roller 21 is provided above the pickup roller 5, and the recording paper reversely conveyed in a U-shape by the sub paper feed roller 2 is provided. The paper is fed to an ink jet recording head 24 by a main paper feed roller 21.
[0008]
Incidentally, reference numerals 7, 7 and 13 in the drawing denote first and second pressing rollers disposed around the sub-paper feed roller 2, and among these pressing rollers 7, 13, the first pressing roller 7, Reference numeral 7 is supported by a common support frame 8 and disposed below the paper end detection sensor 6 in the paper transport direction. When the recording paper is fed to the main paper feed roller 21, a roller 7 is provided. The first roller release lever 9 operated by the release cam 18 operates so as to be separated from the peripheral surface of the sub-paper feed roller 2. 2 is pressed against the peripheral surface.
[0009]
On the other hand, the second pressing roller 13 is supported by the second roller release lever 14 at the confluence of the flat paper guide path 20 and the manual guide path 22 extending to the print head 24 while the sub paper feed roller 2 is supported. The paper is pressed against the peripheral surface of the sub-paper feed roller 2 by an urging spring 15 acting on a lever 14 during automatic paper feeding or manual paper feeding. When the sheet is fed under the paper feed roller 21, the roller release cam 14 acting on the roller release lever 14 operates to separate from the surface of the sub paper feed roller 2.
[0010]
Reference numeral 25 in the figure denotes a cue detection sensor provided immediately before the main paper feed roller 21, and reference numeral 27 denotes a manual paper detection sensor provided in the manual guide path 22.
[0011]
In the paper feeder configured as described above, at the time of normal paper feeding, the cam 18 driven by the paper feed motor rotates in the direction of the arrow in FIG. The two pressing rollers 7, 7 are pressed against the peripheral surface of the sub-paper feed roller 2 by the urging spring 11 acting on the frame 8, and at the same time, the second roller release lever 14 is lifted up and released. The pressing roller 13 is pressed against the peripheral surface of the sub-paper feed roller 2 by the urging force of the spring 15.
[0012]
As a result, the recording paper pulled out of the hopper 3 by the pickup roller 5 reaches the nip portion between the sub-paper feed roller 2 and the pressing roller 7 and is rotated by the sub-paper feed roller 2 rotated by the output signal from the paper end detection sensor. The paper is sent out onto a flat paper guide plate 20.
[0013]
When the recording paper is fed to the main paper feed roller 21, the driving force to the sub paper feed roller 2 is cut off by the detection signal from the cue detection sensor 25, and as shown in FIG. , first, second roller release lever 9, 14 is separated each pressing roller 7 and 13 and more rotated the mountain portion of the cam 18 which is inverted from the peripheral surface of the sub-paper feeding roller 2, the sub-paper The free rotation of the feed roller 2 and the release of the pressure on the recording paper eliminates the influence of the paper feed resistance and the back tension applied to the main paper feed roller 21 and feeds the recording paper on the paper transport path 20. This is fed to the recording head 24 while controlling the amount correctly.
[0014]
On the other hand, when printing on manual paper S such as a postcard, as shown in FIG. 1 , the manual paper is fed from outside the printer body 1 to the nip between the sub paper feed roller 2 and the second pressing roller 13. Part. Thereby, the manual paper detection sensor 27 provided on the manual paper feed path detects this, and the sub paper feed roller 2 is rotated by the detection signal to feed the manual paper S to the main paper feed roller 21.
[0015]
When the manual paper S is fed to the main paper feed roller 21 in this manner, the cueing detection sensor 25 disposed immediately before the main paper feed roller 21 detects this, and based on the detection signal, the sub-position detection sensor 25 detects this. While the driving force of the paper feed roller 2 is cut off, as shown in FIG. 2, the first and second roller release covers 9 and 14 are rotated by the inverted peaks 18a and 18b of the cam 18 to press the respective rollers. The rollers 7 and 13 are separated from the peripheral surface of the sub paper feed roller 2, the free rolling of the sub paper feed roller 2 and the pressing of the manual paper S are released, and the main paper feed roller 21 is rotated. While precisely controlling the feed speed of the manual paper S by only the rotation force of 21, the manual paper S is fed to the recording head 24 to form a clear recorded image on this surface.
In the above-described embodiment, the pressing rollers are provided at two locations, that is, the downstream side of the stacking portion of the paper and the merging portion of the manual feeding route. In addition, in order to keep the accuracy constant, it is sufficient to provide a pressing roller which can freely contact and separate at least at the junction.
[0016]
【The invention's effect】
As described above, according to the present invention, not only can a certain accuracy in the cueing operation be ensured, but also a sheet fed into a flat paper transport path in a state of being bent through a reverse paper transport path. In the case of paper feeding as in the case of manual paper feeding, the recording and writing unit is not affected by the back tension and the load resistance of paper feeding, etc., exerted on the main paper feeding roller due to its stiffness. It is possible to achieve clearer recording and writing by increasing the feeding accuracy of the sheet to the printer as much as possible.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an apparatus according to an embodiment of the present invention, showing an automatic sheet feeding state.
FIG. 2 is a configuration diagram of the above-described device in a state of manual sheet feeding.
[Explanation of symbols]
2 Reversing paper feed roller 3 Hopper 7, 13 Press roller 18 Cam for roller release 20 Flat paper transport path 21 Main paper transport roller 22 Manual feed path 24 Recording heads 24, 27 Detection sensor

Claims (1)

記録書込み部へ至る平坦な紙搬送経路の上手側に用紙を前記記録書込み部へ送り込むメイン紙送りローラを配設するとともに、前記メイン紙送りローラの上手側に、サブ紙送りローラを用いた反転紙搬送経路と、手差し紙検出センサを備えた手差し紙経路とを設けて合流部を形成し、前記合流部に、前記反転紙搬送経路及び手差し紙経路からの各用紙を検出する頭出し検出センサと、前記サブ紙送りローラに接離自在な押圧ローラとを配設して、自動給紙信号もしくは前記手差し紙検出センサからの検出信号のいずれか一方の信号により前記サブ紙送りローラを始動させる一方、前記用紙が前記メイン紙送りローラに所定量送り込まれると、前記頭出し検出センサからの信号により前記サブ紙送りローラへの駆動力を断ち、また前記押圧ローラを前記サブ紙送りローラから離間させてから、前記メイン紙送りローラを始動させるようにしたことを特徴とする紙送り装置。A main paper feed roller for feeding paper to the recording / writing unit is disposed on the upper side of a flat paper transport path to the recording / writing unit, and a reversal using a sub paper feed roller on the upper side of the main paper feed roller. A paper feed path and a manual paper path provided with a manual paper detection sensor are provided to form a junction, and a cueing detection sensor that detects each sheet from the reverse paper transport path and the manual paper path at the junction. And a pressure roller that can be freely attached to and detached from the sub paper feed roller, and the sub paper feed roller is started by one of an automatic paper feed signal and a detection signal from the manual paper detection sensor. on the other hand, when the paper is fed a predetermined amount in the main paper feeding roller, cut off the driving force to the sub-paper feeding roller by a signal from the cueing sensor and the pressing low Said After is separated from the sub-paper feeding roller, paper feeding apparatus being characterized in that so as to start the main paper feeding roller.
JP12021797A 1997-04-09 1997-04-23 Paper feeder Expired - Fee Related JP3542698B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP12021797A JP3542698B2 (en) 1997-04-23 1997-04-23 Paper feeder
DE69824780T DE69824780T2 (en) 1997-04-09 1998-04-09 Document feeder for a printer
DE69828088T DE69828088T2 (en) 1997-04-09 1998-04-09 Document feeder for a printer
EP02004394A EP1219554B1 (en) 1997-04-09 1998-04-09 Document feeder of printer
US09/057,517 US6105953A (en) 1997-04-09 1998-04-09 Document feeder of printer
EP98106579A EP0872351B1 (en) 1997-04-09 1998-04-09 Document feeder of printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12021797A JP3542698B2 (en) 1997-04-23 1997-04-23 Paper feeder

Publications (2)

Publication Number Publication Date
JPH10297780A JPH10297780A (en) 1998-11-10
JP3542698B2 true JP3542698B2 (en) 2004-07-14

Family

ID=14780796

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12021797A Expired - Fee Related JP3542698B2 (en) 1997-04-09 1997-04-23 Paper feeder

Country Status (1)

Country Link
JP (1) JP3542698B2 (en)

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Publication number Publication date
JPH10297780A (en) 1998-11-10

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